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I got the Bosch Platinum +4 spark plugs from NAPA. Order #4417 and stock number (?) of 0 242 235 626-05P. I do not see a heat rating on them or the box. Are these ok? And I haven't changed spark plugs since my '87 Fiero GT, but at the end of your post, the 6-7 is the heat range, not the gap, right?
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